From owner-freebsd-python@freebsd.org Tue Apr 27 19:22:03 2021 Return-Path: Delivered-To: freebsd-python@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id CE1265FE4F3 for ; Tue, 27 Apr 2021 19:22:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4FVBTl4trhz4npY for ; Tue, 27 Apr 2021 19:22:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id A511E5FE3D2; Tue, 27 Apr 2021 19:22:03 +0000 (UTC) Delivered-To: python@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A4AA55FE459 for ; Tue, 27 Apr 2021 19:22:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FVBTl3r5Zz4p1B for ; Tue, 27 Apr 2021 19:22:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 76721205A8 for ; Tue, 27 Apr 2021 19:22:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 13RJM3Q2005534 for ; Tue, 27 Apr 2021 19:22:03 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 13RJM3Jf005533 for python@FreeBSD.org; Tue, 27 Apr 2021 19:22:03 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: python@FreeBSD.org Subject: [Bug 255445] lang/python 3.8/3.9 SIGSEV core dumps in libthr TrueNAS Date: Tue, 27 Apr 2021 19:22:03 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Ports & Packages X-Bugzilla-Component: Individual Port(s) X-Bugzilla-Version: Latest X-Bugzilla-Keywords: crash X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: yocalebo@gmail.com X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: python@FreeBSD.org X-Bugzilla-Flags: maintainer-feedback? X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-python@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: FreeBSD-specific Python issues List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Apr 2021 19:22:03 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255445 --- Comment #2 from yocalebo@gmail.com --- (In reply to Li-Wen Hsu from comment #1) Hi Li-Wen Hsu, thanks for the feedback. I will definitely use stock GENERIC freeBSD 12.2 kernel. The hard part is instrumenting a program that causes t= he SIGSEV :(. I can, however, confirm that stock 12.2 has a regression with threads on py3.8.7. You can use this script to test it. from multiprocessing.pool import ThreadPool from datetime import datetime class Broken(object): def __init__(self): self.pool =3D ThreadPool() def __del__(self): self.pool.close() self.pool.join() ohno =3D Broken() date =3D datetime.now() print(str(date), ohno) Running that 52 times caused an indefinite hang ~19.2% of the time. After cherry-picking the 2 commits I linked above, I confirmed that it resolved t= he "hangs". It never did reproduce a core dump. Anyways, I'll keep trying to write a program that tickles the problem. If y= ou or anyone has any ideas reading this, I'm all ears at this point and will happily try anything at this point :) --=20 You are receiving this mail because: You are the assignee for the bug.=